Configure AppVeyor CI
Configure AppVeyor CI

Adds a build script for AppVeyor, issue #444.

ferventcoder/ffi,ffi/ffi,majioa/ffi,sparkchaser/ffi,yghannam/ffi,majioa/ffi,yghannam/ffi,majioa/ffi,ffi/ffi,yghannam/ffi,yghannam/ffi,ferventcoder/ffi,sparkchaser/ffi,yghannam/ffi,ferventcoder/ffi,sparkchaser/ffi,ferventcoder/ffi,ffi/ffi,majioa/ffi,sparkchaser/ffi